Optical member driving mechanism

ABSTRACT

An optical element driving mechanism is provided and includes a movable portion and a fixed portion. The movable portion includes a carrier for carrying an optical member with a first optical axis. The fixed portion has a top surface, a first side surface and a second side surface. The top surface extends in a direction that is parallel to the first optical axis. The first side surface and the second side surface extend in a direction that is not parallel to the first optical axis from the edge of the top surface and face different sides of the optical member. The shortest distance between the optical member and the first side surface is shorter than the shortest distance between the optical member and the second side surface. The optical element driving mechanism includes a noise-reducing structure configured to avoid a noise entering a photosensitive member.

CROSS REFERENCE TO RELATED APPLICATIONS

This application is a Continuation of pending U.S. patent applicationSer. No. 16/729,029, filed Dec. 27, 2019 and entitled “OPTICAL MEMBERDRIVING MECHANISM”, which claims the benefit of U.S. ProvisionalApplication No. 62/785,593, filed Dec. 27, 2018, and claims priority ofEuropean Patent Application No. 19218896.9, filed Dec. 20, 2019, theentirety of which are incorporated by reference herein.

BACKGROUND Technical Field

The disclosure relates to an optical member driving mechanism, and inparticular to an optical member driving mechanism including a reflectionmember that is disposed in the housing of the optical member drivingmechanism.

Description of the Related Art

With the development of technology, many electronic devices (such assmartphones and digital cameras) nowadays perform the functions of acamera or video recorder. The use of such electronic devices has becomeincreasingly widespread, and these electronic devices have been designedfor convenience and miniaturization to provide users with more choices.

Electronic devices with a camera or video function usually have a lensdriving module disposed therein to drive a lens to move along an opticalaxis. Therefore, an autofocus (AF) and/or optical image stabilization(OIS) function is achieved. Light may pass through the lens and form animage on a photosensitive member.

However, during forming an optical image, external noise usually entersthe photosensitive member due to reflection. As a result, the imagequality is usually not good enough to meet the requirement of the imagequality for users. Therefore, how to solve the aforementioned problemhas become an important topic.

BRIEF SUMMARY

The present disclosure provides an optical member driving mechanism. Theoptical member driving mechanism includes a movable portion and a fixedportion. The movable portion includes a carrier for carrying an opticalmember with a first optical axis. The movable portion is movablerelative to the fixed portion. The fixed portion includes a top surface,a first side surface and a second side surface. The top surface extendsin a direction that is parallel to the first optical axis. The firstside surface extends in a direction that is not parallel to the firstoptical axis from the edge of the top surface and faces the outlet endof the optical member. The second side surface extends in a directionthat is not parallel to the first optical axis from the edge of the topsurface and faces the incident end of the optical member. The shortestdistance between the optical member and the first side surface isshorter than the shortest distance between the optical member and thesecond side surface. The optical member driving mechanism furtherincludes an electromagnetic driving assembly that drives the movableportion to move relative to the fixed portion. The optical memberdriving mechanism also includes a noise-reducing structure disposed overthe base and configured to avoid a noise entering a photosensitivemember.

In an embodiment, the optical member further has a first section and asecond section, the first section is closer to the incident end of theoptical member than the second section, the first section and the secondsection are arranged along the first optical axis, and in a directionthat is perpendicular to the first optical axis, the largest size of thefirst section is greater than the largest size of the second section.

In an embodiment, the housing further has: a first opening, a secondopening and a third opening. The first opening is located on the firstside surface. The second opening is located on the second side surface,wherein the first optical axis passes through the first opening and thesecond opening. The third opening is located on the top surface, whereinthe distance between the third opening and the first opening is longerthan the distance between the third opening and the second opening.

In an embodiment, the housing further has a third side surface and aplurality of holes that are located on the third side surface, and thethird side surface is not parallel to the first side surface or thesecond side surface. In an embodiment, the optical member drivingmechanism further includes a reflection member that is disposed in thehousing, wherein the shortest distance between the reflection member andthe first side surface is longer than the shortest distance between thereflection member and the second side surface.

In an embodiment, the reflection member has a second optical axis thatis not parallel to the first optical axis. In an embodiment, the fixedportion further includes a frame that is disposed between the carrierand the housing, and when viewed in the direction that is parallel tothe first optical axis, the frame and the carrier at least partiallyoverlap. In an embodiment, the frame has a first jagged surface disposedto face the base.

In an embodiment, the carrier further includes a protruding portion thatprotrudes from the optical member and extends towards the base, and whenviewed in the direction that is parallel to the first optical axis, theprotruding portion and the optical member at least partially overlap. Inan embodiment, the protruding portion further has a second jaggedsurface disposed to face the base. In an embodiment, the electromagneticdriving assembly comprises a magnetic member and a coil, and themagnetic member is a tripolar magnet.

In an embodiment, the fixed portion further includes a frame that isdisposed between the carrier and the housing, and when viewed in adirection that is perpendicular to the first optical axis, the magneticmember is exposed from the frame. In an embodiment, the optical memberdriving mechanism further includes a first bonding material and a secondbonding material, wherein the first bonding material is bonded betweenthe housing and the frame, the second bonding material is bonded betweenthe magnetic member and the frame, and the first bonding material isdifferent from the second bonding material.

In an embodiment, the base further includes a first barrier and a secondbarrier, the first barrier and the second barrier protrude towards thetop surface, and the shortest distance between the first barrier and thefirst side surface is shorter than the shortest distance between thesecond barrier and the first side surface. In an embodiment, the basefurther includes a stopping portion that is disposed between the carrierand the second side surface. In an embodiment, the base further includesa metallic member that is embedded in the stopping portion.

In an embodiment, when viewed in a direction that is perpendicular tothe first optical axis, the carrier is partially exposed from theoptical member, and the shortest distance between the exposed portion ofthe optical member and the first side surface is longer than theshortest distance between the unexposed portion of the optical memberand the first side surface.

In an embodiment, the optical member driving mechanism further includesa sensing assembly for detecting the movement of the movable portionrelative to the fixed portion, wherein when viewed in a direction thatis perpendicular to the first optical axis, the sensing assembly and theoptical member partially overlap.

In an embodiment, the optical member driving mechanism further includesa plurality of first elastic members disposed on the carrier andconnected to the base. In an embodiment, the optical member drivingmechanism further includes a plurality of second elastic membersconnected to the first elastic members and the base, wherein the secondelastic members extend in the direction that is perpendicular to thefirst optical axis.

BRIEF DESCRIPTION OF THE DRAWINGS

The disclosure can be more fully understood by reading the subsequentdetailed description and examples with references made to theaccompanying drawings, wherein:

FIG. 1 is a perspective view illustrating an optical member drivingmechanism in accordance with an embodiment of the present disclosure.

FIG. 2 is an exploded view illustrating the optical member drivingmechanism shown in FIG. 1 .

FIG. 3 is a cross-sectional view illustrating along line A-A shown inFIG. 1 .

FIG. 4 is a perspective view illustrating the optical member drivingmechanism shown in FIG. 1 when viewed in another direction.

FIG. 5 is a perspective view illustrating the interior structure of theoptical member driving mechanism in accordance with an embodiment of thepresent disclosure.

FIG. 6 is a perspective view illustrating the interior structure of theoptical member driving mechanism shown in FIG. 5 when viewed in anotherdirection.

FIG. 7 is a perspective view illustrating the interior structure of theoptical member driving mechanism in accordance with an embodiment of thepresent disclosure.

FIG. 8 is a top view illustrating the interior structure of the opticalmember driving mechanism in accordance with an embodiment of the presentdisclosure.

FIG. 9 is a side view illustrating the interior structure of the opticalmember driving mechanism shown in FIG. 8 .

DETAILED DESCRIPTION OF THE INVENTION

The optical member driving mechanisms of some embodiments of the presentdisclosure are described in the following description. However, itshould be appreciated that the following detailed description of someembodiments of the disclosure provides various concepts of the presentdisclosure which may be performed in specific backgrounds that can varywidely. The specific embodiments disclosed are provided merely toclearly describe the usage of the present disclosure by some specificmethods without limiting the scope of the present disclosure.

In addition, relative terms such as “lower” or “bottom,” “upper” or“top” may be used in the following embodiments in order to describe therelationship between one element and another element in the figures. Itshould be appreciated that if the device shown in the figures is flippedupside-down, the element located on the “lower” side may become theelement located on the “upper” side.

It should be understood that although the terms “first,” “second,”“third,” etc. may be used herein to describe various elements, materialsand/or portions, these elements, materials and/or portions are notlimited by the above terms. These terms merely serve to distinguishdifferent elements, materials and/or portions. Therefore, a firstelement, material and/or portion may be referred to as a second element,material and/or portion without departing from the teaching of someembodiments in the present disclosure.

Unless defined otherwise, all terms (including technical and scientificterms) used herein have the same meaning as commonly understood by oneof ordinary skill in the art to which this disclosure belongs. It shouldbe appreciated that, in each case, the term, which is defined in acommonly used dictionary, should be interpreted as having a meaning thatconforms to the relative skills of the present disclosure and thebackground or the context of the present disclosure, and should not beinterpreted in an idealized or overly formal manner unless so defined inthe present disclosure. In addition, the terms “substantially,”“approximately” or “about” may also be recited in the presentdisclosure, and these terms are intended to encompass situations orranges that is substantially or exactly the same as the descriptionherein. It should be noted that unless defined specifically, even if theabove terms are not recited in the description, it should be read as thesame meaning as those approximate terms are recited.

FIG. 1 is a schematic perspective view illustrating an optical memberdriving mechanism 801 in accordance with an embodiment of the presentdisclosure. It should be noted that, in this embodiment, the opticalmember driving mechanism 801 may be, for example, disposed in theelectronic devices with camera function for driving an optical member900, and can perform an autofocus (AF) and/or optical imagestabilization (OIS) function.

As shown in FIG. 1 , the optical member driving mechanism 801 has acentral axis C that is substantially parallel to the Z axis. The opticalmember driving mechanism 801 has a first optical axis O1 that issubstantially parallel to the X axis. The optical member drivingmechanism 801 includes a housing 810 which has a top surface 811 and afirst side surface 812. The top surface 811 extends in a direction thatis parallel to the first optical axis O1 (i.e. the X-Y plane). The firstside surface 812 extends from an edge of the top surface 811 along adirection (the Z axis) that is perpendicular to the first optical axisO1. In some embodiments, the first side surface 812 extends from theedge of the top surface 811 along a direction that is not parallel tothe first optical axis O1. In addition, the housing 810 has a firstopening 815 that is located on the first side surface 812, and the firstoptical axis O1 may pass through the first opening 815.

The optical member driving mechanism 801 further includes a reflectionmember 890 that is disposed in the housing 810 of the optical memberdriving mechanism 801, and the reflection member 890 has a secondoptical axis O2 that is substantially parallel to the Z axis. In thepresent embodiment, the first optical axis O1 is substantiallyperpendicular to the second optical axis O2, but it is not limitedthereto. In some embodiments, the first optical axis O1 is not parallelto the second optical axis O2. As a result, light may enter the opticalmember driving mechanism 801 along the second optical axis O2, and thedirection of the light may be changed by the reflection member 890, suchthat the light may pass through the optical member 900 along the firstoptical axis O1. After the light passes through the optical member 900,it may travel to an image sensor (not shown) that is disposed out of theoptical member driving mechanism 801, and thereby an image may begenerated on the electronic device.

FIG. 2 is an exploded view illustrating the optical member drivingmechanism 801 shown in FIG. 1 . In the present embodiment, the opticalmember driving mechanism 801 has a substantial rectangular structure.The optical member driving mechanism 801 mainly includes a fixed portionF, a movable portion M, a plurality of first elastic members 860, aplurality of second elastic members 861, a first electromagnetic drivingassembly 840 and a second electromagnetic driving assembly 845. Thefixed portion F includes a housing 810, a base 820, a frame 850, and acircuit component 870.

The housing 810 is disposed on the base 820, and protect the elementsdisposed inside the optical member driving mechanism 801. In someembodiments, the housing 810 is made of metal or another material withsufficient hardness to provide good protection. The frame 850 isdisposed in and affixed to the housing 810. The circuit component 870 isdisposed on the base 820 for transmitting electric signals, performingthe autofocus (AF) and/or optical image stabilization (OIS) function.For example, the optical member driving mechanism 801 may control theposition of the optical member 900 based on the aforementioned electricsignals so as to form an image.

The movable portion M is movable relative to the fixed portion F. Themovable portion M mainly includes a carrier 830 which carries theoptical member 900. As shown in FIG. 2 , the carrier 830 is movablyconnected to the housing 810 and the base 820. The first elastic members860 are disposed on the carrier 830. The second elastic members 861extend in a vertical direction (the Z axis), and are connected to thefirst elastic members 860 and the base. As a result, the carrier 830 maybe connected to the base 820 via the first elastic members 860 and thesecond elastic members 861. For example, the first elastic members 860and the second elastic members 861 are made of metal or another suitableelastic material.

The first electromagnetic driving assembly 840 includes first magneticmembers 841 and first driving coils 842. The first magnetic members 841may be disposed on the frame 850, and the corresponding first drivingcoils 842 are disposed on the carrier 830. When current is applied tothe first driving coils 842, an electromagnetic driving force may begenerated by the first driving coils 842 and the first magnetic members841 (i.e. the first electromagnetic driving assembly 840) to drive thecarrier 830 and the optical member 900 carried therein to move along ahorizontal direction (the X-Y plane) relative to the base 820,performing the autofocus (AF) and/or optical image stabilization (OIS)function.

In addition, the second electromagnetic driving assembly 845 includessecond magnetic members 846 and second driving coils 847. The secondmagnetic members 846 may be disposed on the carrier 830, and thecorresponding second driving coils 847 are disposed on the base 820. Forexample, the second driving coils 847 may be flat-plate coils such thatthe difficulty and the required time for assembly may be reduced. When acurrent is applied to the second driving coils 847, an electromagneticdriving force may be generated by the second electromagnetic drivingassembly 845 to drive the carrier 830 and the optical member 900 carriedtherein to move along the first optical axis O1 (the X axis) relative tothe base 820, performing the autofocus (AF) function. The carrier 830may be movably suspended between the frame 850 and the base 820 by theelectromagnetic driving force of the first electromagnetic drivingassembly 840, the second electromagnetic driving assembly 845 and theforce exerted by the first elastic members 860, the second elasticmembers 861. Furthermore, a magnetic permeable plate P is disposed onthe second magnetic members 846 for concentrating the magnetic field ofthe second magnetic members 846 so that the efficiency of the secondelectromagnetic driving assembly 845 may be improved. In someembodiments, the magnetic permeable plate P may be made of metal oranother material with sufficient magnetic permeability.

The sensing assembly 880 includes a sensor 881, a reference member 882and an integrated circuit (IC) component 883. In the present embodiment,the sensor 881 and the integrated circuit component 883 are disposed onthe base 820, and the reference member 882 is disposed in the carrier830. A plurality of reference members 882 may be disposed. For example,the reference member 882 is a magnetic member, the sensor 881 may detectthe change of the magnetic field of the reference member 882, and theposition of the carrier 830 (and the optical member 900) may bedetermined by the integrated circuit component 883. In some embodiments,one of the sensor 881 and the reference member 882 is disposed on thefixed portion F, and the other of the sensor 881 and the referencemember 882 is disposed on the movable portion M.

FIG. 3 is a cross-sectional view illustrating along line A-A shown inFIG. 1 . As shown in FIG. 3 , the optical member 900 has an incident endI and an outlet end 0. In the present embodiment, the light may enterthe optical member 900 from the incident end I along the first opticalaxis O1, and exit the optical member 900 from the outlet end 0. In thepresent embodiment, the first side surface 812 faces the outlet end 0 ofthe optical member 900, and the second side surface 813 faces theincident end I of the optical member 900.

Since the reflection member 890 is also disposed in the housing 810, theoptical member 900 is not located at the center of the optical memberdriving mechanism 801. In the present embodiment, the reflection member890 is closer to the second side surface 813 than the optical member900, and the optical member 900 is closer to the first side surface 812than the reflection member 890. In other words, the shortest distance (afirst distance W1) between the reflection member 890 and the first sidesurface 812 is longer than the shortest distance (a second distance W2)between the reflection member 890 and the second side surface 813. Theshortest distance (a third distance W3) between the optical member 900and the first side surface 812 is shorter than the shortest distance (afourth distance W4) between the optical member 900 and the second sidesurface 813. In the present embodiment, the frame 850 is disposedbetween the carrier 830 and the housing 810, and when viewed in adirection (the X axis) that is parallel to the first optical axis O1,the frame 850 and the carrier 830 at least partially overlap.

FIG. 4 is a perspective view illustrating the optical member drivingmechanism 801 shown in FIG. 1 when viewed in another direction. As shownin FIG. 4 , the housing further has a second side surface 813 and athird side surface 814. In the present embodiment, the second sidesurface 813 extends from an edge of the top surface 811 along adirection (the Z axis) that is perpendicular to the first optical axisO1. In some embodiments, the second side surface 813 extends from theedge of the top surface 811 along a direction that is not parallel tothe first optical axis O1. The housing 810 has a second opening 816 thatis located on the second side surface 813, and the first optical axis O1may pass through the second opening 816. In other words, the first sidesurface 812 and the second side surface 813 are substantially parallelto each other.

The third side surface 814 extends from an edge of the top surface 811along a direction (the Z axis) that is perpendicular to the firstoptical axis O1, and is located between the first side surface 812 andthe second side surface 813. In the present embodiment, the third sidesurface 814 is perpendicular to the first side surface 812 and thesecond side surface 813. In some embodiments, the third side surface 814is not parallel to the first side surface 812 or the second side surface813. A plurality of holes 818 may be disposed on the third side surface814 and correspond to the reflection member 890. For example, anadhesive (not shown) may be disposed in the holes 818, such that thereflection member 890 may be affixed in the optical member drivingmechanism 801.

In addition, a third opening 817 may be formed on the top surface 811,and correspond to the reflection member 890, such that the light is ableto enter the optical member 900 located inside the optical memberdriving mechanism 801. Since the reflection member 890 is disposed nearthe first side surface 812, the third opening 817 may be closer to thesecond opening 816 instead of the first opening 815. In other words, thedistance between the third opening 817 and the first opening 815 may begreater than the distance between the third opening 817 and the secondopening 816.

It should be noted that in the present embodiment, the light would notactually pass through the second opening 816. However, during theassembly of the optical member driving mechanism 801, the optical member900 may be disposed in the optical member driving mechanism 801 via thesecond opening 816 first, and then the reflection member 890 is disposedin the optical member driving mechanism 801. An optical calibrationprocess is performed to the optical member 900 and the reflection member890, and thereby the yield of the optical member driving mechanism 801may be increased. The above design may simplify the manufacturingprocess.

FIG. 5 is a perspective view illustrating the interior structure of theoptical member driving mechanism 801 when viewed in the outlet end 0 ofthe optical member 900. It should be appreciated that in order toclearly show the interior structure of the optical member drivingmechanism 801, the housing 810 and the reflection member 890 are notillustrated in the present embodiment. As shown in FIG. 5 , the base 820further includes a first barrier 821 and a second barrier 822, whereinthe first barrier 821 and the second barrier 822 protrude towards thetop surface 811 of the housing 810, and the shortest distance betweenthe first barrier 821 and the first side surface 812 is shorter than theshortest distance between the second barrier 822 and the first sidesurface 812. Thanks to the arrangement of the first barrier 821 and thesecond barrier 822, light is prevented from entering the image sensordue to it being reflected by the housing 810 and the circuit component870. It should be noted that, although the first barrier 821 and thesecond barrier 822 are illustrated in the present embodiment, thismerely serves as an example. Those skilled in the art may adjust thepositions or number of barriers. In some embodiments, a jagged structureor any other suitable irregular structure may be on the base 820 (suchas on the first barrier 821 and/or the second barrier 822) by a laserengraving process, and thereby the reflection inside the optical memberdriving mechanism 801 may be reduced.

In addition, in the present embodiment, when viewed in a direction (theZ axis) that is perpendicular to the first optical axis O1, the firstmagnetic members 841 are partially exposed from the frame 850. In thepresent embodiment, the first magnetic members 841 are tripolar magnetssuch that the assembly process may be simplified, and the assemblyprecision and the push strength may be enhanced. However, the presentdisclosure is not limited thereto. In some other embodiments, each ofthe first magnetic members 841 may also be a combination of threemagnets. Furthermore, the optical member driving mechanism 801 furtherincludes a first bonding material and a second bonding material (notshown), wherein the first bonding material is bonded between the housing810 and the frame 850, the second bonding material is bonded between thefirst magnetic members 841 and the frame 850. Since in some embodiments,the housing 810 and the first magnetic members 841 are affixed to theframe 850 by different processes, the first bonding material isdifferent from the second bonding material. For example, the firstbonding material is a light-curing adhesive, and thereby after thehousing 810 and the frame 850 are affixed, subsequent assembly process(such as the process of affixing the first magnetic members 841 and theframe 850) may be performed in a short time.

FIG. 6 is a perspective view illustrating the interior structure of theoptical member driving mechanism 801 when viewed in the incident end Iof the optical member 900. As shown in FIG. 6 , the base furtherincludes a stopping portion 823 that is disposed between the carrier 830and the second side surface 813 (as shown in FIG. 4 ). Thanks to thearrangement of the stopping portion 823, the moving range of the carrier830 may be limited. As a result, collisions between the carrier 830 thereflection member 890 may be avoided, and the reflection member 890and/or the optical member 900 can remain undamaged. In addition, ametallic member 824 is embedded into the stopping portion 823, enhancingthe structural strength of the stopping portion 823. Therefore, thestopping portion 823 is prevented from multiple collisions and remainsundamaged.

FIG. 7 is a perspective view illustrating the interior structure of theoptical member driving mechanism 801 in accordance with an embodiment ofthe present disclosure. It should be noted that in order to clearly showthe structure of the frame 850 and the carrier 830, the frame 850, thecarrier 830 and the optical member 900 are illustrated upside-down. Thatis, the upper side of FIG. 7 is towards the base 820, and the lower sideis towards the top surface 811 of the housing 810. As shown in FIG. 7 ,the frame 850 has a first jagged surface 851 that is disposed to facethe base 820. In addition, the carrier 830 further includes a protrudingportion 831 that protrudes from the optical member 900 and extendstowards the base 820. When viewed in a direction (the X axis) that isparallel to the first optical axis O1, the protruding portion 831 andthe optical member 900 at least partially overlap. The protrudingportion 831 further has a second jagged surface 832 that is disposed toface the base 820.

Thanks to the arrangement of the protruding portion 831, the possibilitythat the light directly illuminates the inner surface of the metallichousing 810 may be reduced, such that the light reflection may also bereduced. Furthermore, the first jagged surface 851 and the second jaggedsurface 832 are configured for weakening the intensity of lightreflection after the light illuminates the above jagged surfaces. Sincethe possibility and/or intensity of the light reflected inside theoptical member driving mechanism 801 may be reduced, noise may be lesslikely to enter the image sensor due to reflection. Therefore, imagequality may be unaffected.

For example, the jagged structure on the first jagged surface 851 and/orthe second jagged surface 832 may be formed by a laser engravingprocess. In some embodiments, the size in the Z axis of the above jaggedstructures may be in a range from 0.1 mm to 0.4 mm, but it is notlimited thereto. In addition, the jagged structures may be formed asregular structures or irregular structures as required. It should benoted that although the first jagged surface 851 and the second jaggedsurface 832 are both disposed in the present embodiment, it merelyserves as an example. Those skilled in the art may determine whether thefirst jagged surface 851 and/or the second jagged surface 832 aredisposed, or adjust the position of the first jagged surface 851 and/orthe second jagged surface 832.

The optical member driving mechanism 801 further includes an extinctionsheet E that is disposed between the carrier 830 and the optical member900. More specifically, the extinction sheet E is disposed in a gapbetween the carrier 830 and the optical member 900. In some embodiments,the extinction sheet E may also be disposed on the second jagged surface832, or disposed between the first barrier 821 and the second barrier822, but it is not limited thereto. Thanks to the arrangement of theextinction sheet E, the reflection of the noise may be effectivelyreduced, avoiding the noise entering the image sensor. For example, theextinction sheet E may be made of resin or any other suitable material,and has a porous structure. In some embodiments, the extinction sheet Emay lower the reflectivity of the light with a wavelength between 250 nmand 2500 nm below 1.6%. In some embodiments, the thickness of theextinction sheet E may be in a range from 0.1 mm to 0.5 mm.

In addition, the optical member 900 further has a first section 901 anda second section 902 (as shown in FIG. 8 ), wherein the first section901 is closer to the incident end I of the optical member 900. The firstsection 901 and the second section 902 are arranged along the firstoptical axis O1, wherein the first section 901 is closer to the secondside surface 813 than the second section 902. In other words, theshortest distance between the first section 901 and the second sidesurface 813 is shorter than the shortest distance between the secondsection 902 and the second side surface 813. In a direction (the Y axis)that is perpendicular to the first optical axis O1, the largest size ofthe first section 901 is greater than the largest size of the secondsection 902. That is, the width of the first section 901 is greater thanthe width of the second section 902 in the Y axis. Since the size of thefirst section 901 is larger, the carrier 830 may cover the secondsection 902, and the first section 901 of the optical member 900 may beexposed.

FIG. 8 is a top view illustrating the base 820, the circuit component870, the second electromagnetic driving assembly 845, the sensingassembly 880 and the optical member 900, and FIG. 9 is a side viewillustrating the structure shown in FIG. 8 when viewed in the incidentend I. As shown in FIGS. 8 and 9 , when viewed in a direction (the Zaxis) that is perpendicular to the first optical axis O1, the integratedcircuit component 883 of the sensing assembly 880 and the optical member900 may partially overlap. In the present embodiment, the secondmagnetic members 846 are tripolar magnets. In some other embodiments,each of the second magnetic members 846 may also be a combination ofthree magnets.

As set forth above, the embodiments of the present disclosure provide anoptical member driving mechanism including a reflection member that isdisposed in the housing of the optical member driving mechanism. Bymeans of arranging the reflection member in the housing, the reflectionmember may be effectively protected and remain undamaged. In addition,the embodiments of the present disclosure provide various structuresconfigured to avoid refection, such as jagged surfaces, barriers, and/orextinction plates, etc. Therefore, the noise may be prevented fromentering the image sensor due to reflection, preserving image quality.

While the embodiments and the advantages of the present disclosure havebeen described above, it should be understood that those skilled in theart may make various changes, substitutions, and alterations to thepresent disclosure without departing from the spirit and scope of thepresent disclosure. In addition, the scope of the present disclosure isnot limited to the processes, machines, manufacture, composition,devices, methods and steps in the specific embodiments described in thespecification. Those skilled in the art may understand existing ordeveloping processes, machines, manufacture, compositions, devices,methods and steps from some embodiments of the present disclosure. Aslong as those may perform substantially the same function in theaforementioned embodiments and obtain substantially the same result,they may be used in accordance with some embodiments of the presentdisclosure. Therefore, the scope of the present disclosure includes theaforementioned processes, machines, manufacture, composition, devices,methods, and steps. Furthermore, each of the appended claims constructsan individual embodiment, and the scope of the present disclosure alsoincludes every combination of the appended claims and embodiments.

What is claimed is:
 1. An optical member driving mechanism, comprising:a movable portion comprising a carrier for carrying an optical memberwith a first optical axis; a fixed portion, wherein the movable portionis movable relative to the fixed portion, and the fixed portion has ahousing and a base, the housing is disposed on the base, and the housingcomprises: a top surface extending along a direction that is parallel tothe first optical axis; a first side surface, extending along adirection that is not parallel to the first optical axis from an edge ofthe top surface, facing an outlet end of the optical member; and asecond side surface, extending along a direction that is not parallel tothe first optical axis from an edge of the top surface, facing anincident end of the optical member, wherein a shortest distance betweenthe optical member and the first side surface is shorter than a shortestdistance between the optical member and the second side surface; anelectromagnetic driving assembly that drives the movable portion to moverelative to the fixed portion; and a noise-reducing structure disposedover the base and configured to avoid a noise entering a photosensitivemember.
 2. The optical member driving mechanism as claimed in claim 1,wherein the optical member further comprises a first section and asecond section, the first section is closer to the incident end of theoptical member than the second section, the first section and the secondsection are arranged along the first optical axis, and in a directionthat is perpendicular to the first optical axis, a largest size of thefirst section is greater than a largest size of the second section. 3.The optical member driving mechanism as claimed in claim 1, wherein thehousing further has: a first opening located on the first side surface;a second opening located on the second side surface, wherein the firstoptical axis passes through the first opening and the second opening;and a third opening located on the top surface, wherein a distancebetween the third opening and the first opening is longer than adistance between the third opening and the second opening.
 4. Theoptical member driving mechanism as claimed in claim 1, wherein thehousing further has a third side surface and a plurality of holeslocated on the third side surface, and the third side surface is notparallel to the first side surface or the second side surface.
 5. Theoptical member driving mechanism as claimed in claim 1, furthercomprising a reflection member disposed in the housing, wherein ashortest distance between the reflection member and the first sidesurface is longer than a shortest distance between the reflection memberand the second side surface.
 6. The optical member driving mechanism asclaimed in claim 5, wherein the reflection member has a second opticalaxis that is not parallel to the first optical axis.
 7. The opticalmember driving mechanism as claimed in claim 1, wherein the fixedportion further comprises a frame disposed between the carrier and thehousing, and when viewed in the direction that is parallel to the firstoptical axis, the frame and the carrier at least partially overlap. 8.The optical member driving mechanism as claimed in claim 7, wherein theframe has a first jagged surface disposed to face the base.
 9. Theoptical member driving mechanism as claimed in claim 1, wherein thecarrier further comprises a protruding portion that protrudes from theoptical member and extends towards the base, and when viewed in thedirection that is parallel to the first optical axis, the protrudingportion and the optical member at least partially overlap.
 10. Theoptical member driving mechanism as claimed in claim 9, wherein theprotruding portion further has a second jagged surface disposed to facethe base.
 11. The optical member driving mechanism as claimed in claim1, wherein the electromagnetic driving assembly comprises a magneticmember and a coil, and the magnetic member is a tripolar magnet.
 12. Theoptical member driving mechanism as claimed in claim 11, wherein thefixed portion further comprises a frame disposed between the carrier andthe housing, and when viewed in a direction that is perpendicular to thefirst optical axis, the magnetic member is exposed from the frame. 13.The optical member driving mechanism as claimed in claim 12, furthercomprising: a first bonding material and a second bonding material,wherein the first bonding material is bonded between the housing and theframe, the second bonding material is bonded between the magnetic memberand the frame, and the first bonding material is different from thesecond bonding material.
 14. The optical member driving mechanism asclaimed in claim 1, wherein the base further comprises a first barrierand a second barrier, the first barrier and the second barrier protrudetowards the top surface, and a shortest distance between the firstbarrier and the first side surface is shorter than a shortest distancebetween the second barrier and the first side surface.
 15. The opticalmember driving mechanism as claimed in claim 1, wherein the base furthercomprises a stopping portion disposed between the carrier and the secondside surface.
 16. The optical member driving mechanism as claimed inclaim 15, wherein the base further comprises a metallic member embeddedin the stopping portion.
 17. The optical member driving mechanism asclaimed in claim 1, wherein when viewed in the direction that isperpendicular to the first optical axis, the optical member is partiallyexposed from the carrier, and a shortest distance between an exposedportion of the optical member and the first side surface is longer thana shortest distance between an unexposed portion of the optical memberand the first side surface.
 18. The optical member driving mechanism asclaimed in claim 1, further comprising a sensing assembly for detectingthe movement of the movable portion relative to the fixed portion,wherein when viewed in the direction that is perpendicular to the firstoptical axis, the sensing assembly and the optical member partiallyoverlap.
 19. The optical member driving mechanism as claimed in claim 1,further comprising a plurality of first elastic members disposed on thecarrier and connected to the base.
 20. The optical member drivingmechanism as claimed in claim 19, further comprising a plurality ofsecond elastic members connected to the first elastic members and thebase, wherein the second elastic members extend in the direction that isperpendicular to the first optical axis.